[Polypoid endometriosis of the colon diagnosed using endoscopic biopsy]

A case of colonic endometriosis in a 32 year-old woman in presented. We comment the clinical presentation, with rectal hemorrhages as the only symptom; the involvement of the colonic mucosa in the form of a polypoid lesion and the finding of endometrium in the mucosal biopsy. These exceptional coincidences made the pathological diagnosis possible in the tissue obtained by the endoscopic biopsy.